Conveyer system



y w. T. DONALDSON CONVEYER SYSTEM Filed May 7, 1932 5 Sheets-Sheet 1 W Mm m A d m% m m w 9 m7 y 1933- w. T. DONALDSON 1,919,934

GONVEYER SYSTEM W WM July 25, 1933.

. TL mmlq w. T. DONALDSON 9,934

CONVEYER SYSTEM Filed May "7, 1932 5 Sheets-Sheet 3 "ll h llll 1 (IIINIIIIIIEIIIUl-llllllll I-InII-lnI-mI-nnlI William 770M450);

w. T. DONALDSON 1,919,934

CONVEYER SYSTEM Filed May 7, 1932 5 Sheets-Sheet 5 MW xv n8 mQ TM v A% l l l l I l l l IIL July 25, 1933.

gwuentw Wzwmm Tfimaldsm w M M I 6 W W mm I Patexited July I This invention mrlafies 'go 1i; conveyer Qsy s v tam having despatchingjand receiving station aw-ithial c0i1veye having 'aise'fisWOf v spaced carriers and '-receiving find fd'es'patch ing stati0ns',aa unitary, comp act anda readily.

" adjustable, timer" which may; be located at a tinlingyand control Y mechanism,

' the several.recsivifig statiqns.

' removed tions and of the type wherein a load. maybe automatically"v delivsiiedj ai'j ar iy feceiving sits? tibii: undeli control of electric 1 switchss; 1

cated at the'd espatching station 01' stations.

Y It Y is my object gto Tender suh I system, i

more uniformly cerminl-"iirOperation by simplified: andllnore e'fiicient arrangement; of.

A s-furtherobject is to. prOmdg in lc'onibiiii pint remocs item the ,dspatqhing' and re-.

c's-iying stations but control ofswitc hes; iocatedz atathdespatchmg statmr is for aut maticailj delivering,- loads fifiqnm the barriers .The invention 211st includes c ertai i other imiieiifeatures conti iiction ashsreinaffisr more'fully set forth' V The Y invention W111 be best undsrstoddglb;

features'mf in suitablsz-flc onveyer' system nto Y.- F g; 3. 1s aplanvi'ew 012113116 't- 11 n I drive "gear ng top h' ame l member Y "flgmp mw Lfika May 7,19 2. seriai ixogsoas's.

' The co'n vey er and ciu'rii s illustrated hers; inure of me type, describ'ejd and claimed; in I i an application of J 01111 fla 'esar and Smith: ZEggIeSt n, SeiialfNdKSZAS, filed. Se'pt'eni J her '17, 1930.. It will beundei'stood that-this;

i'sjoiily one form of conis'yer to whichwythe inmni-ion may be"app1ied .-.q; 1

1 sp fbckt Whel l2 ap the iipper xtremi ty of snl; eie'vzs0r shaft a ml 0n afsimilar sprockeja wheel; 13 the lower and thereof; Secuied within ch 21111;; 11.;

ti al, verticak section: shO 'ing b,idspathing' I stafnionfwifliythe associated lozidinglmcha I nism and'a portimi of'the conveyer;

taken 1011;

Fig. 9 I is a sctionr' Fig plO is a typical Wiring" digi alii forz the embodimentwof the: invention iHust 'ai -ed; v

7 .'mwe' i'; 6 f aa' r irs 'v i A loeistshown in F' s. l,..2 and-7, 011611911 vey has an endless 01121111 llft'ramed 911 at regilia rly spaced intervals ts thefl chain llgxisazssiis 0f Carriers indib zited genergliy by the; in memiil Thess Curriers, are, lflfiireilc 130 the z compz nying i dra'wings f infguld'ed "along i Spaced Parallel l Y whichz i" f =1 i )1.

- 9 Figure l is a front deifgttiofl iliiisjfirating diagrammfiticaily thjei p if ipal imecha'nical' V 1 V $80 l'fani s nmz r :XYQQQLS 1 9 a 's mounmdgo j oppos'it'ssldes fa'block-QO whichflls swivsled O11 the pin 16' and rlgidiy, Iconnscted wither 'TO iiiailitainthe cdr ie mmbvr 17 ii 1 up f fight :POSXUOD throughlout its, course. 1.

*iiid arranged to be receiv'di i1 1 notchs 22 ff;

ilar gearing. The notches 22 in the disks 23: are arranged to registerwith the openings between the guides i at the moment the wheel 21 on'a'carrler reaches the periphery of the diskandon further movement of the carrier and disk. the latterengages the wheel 21 on the carrier andmoves it'in alrarc cor respondingto the are described by the-pivot pi'n16 as it passes around the'periphery of the sprocket wheel Tosupport a load,'

such as'a box 25; o11;aicarrier114, the latter is provided with an arm 26 projecting there fromand'side walls 27 spaced laterally from' the arm 26. V 1 At the upper end' of the. conveyer, the

' sprocket wheel 12 is fixed on fa horizontal shaft 28 whichprojects to the rear and is arranged to be driven by suitable sprocket Wheels andiachain 29l'extending to a hori- Zontal shaft 30. The latter shaft is driven by connection with 'an electric motor 31 through suitablespeed reducing. gears in a casing 32. This motor and the, associated drive mechanism and lip-per end of the elev- V ator frame are supported ona floor or platform'33 having a rectangular opening 33m permitting the passage of the carriersla.

To operatively connect loading and delivery gearing in the casing 32 and isarranged todrive a-verticalsh'aft 35 through beveled 'Despatching and veyer therethrough. The despatching sta tions are indicated generally by the nuinerals 37 at each floor and the receiving stations are indicated by the numerals 38, the former being disposed adjacent to "the upwardly 1 moving reach of thechain '11 and the latter adj acent' to the downwardly moving reachi centrally between the rails 39 is atiltable switch support 41 having atone end a small roller 42 to be actuated bya box onthej .7 loading station. Amercioidswitch t3 is ar ranged on the support 41 tobe closed when their pas Mechanism for loading the carriers is as: sociated with each of the despatching sta tions; These mechanisms, which are duplicated at the floors A, 'B and Cpeach have ;mech-anism with the 1notor- 31,a horizontal shaft 34'is connected to the motor 31 througl'r receiving stations are 10- g cated'on each of floors A, and- Ggsaid floors having openings, similartoi the openings 33w, permitting!the,passage of the con-f a pair of paralleljarms "jcarrying anti 1 friction wheels 46. Thearms- 45 are rigidly secured to'a casting 47 having a long hub portion 48Ifixed on a horizontal shaft so that the arms 45 are arranged to tilt about the axis of the shaft 49 from an elevated posi tion, like that vshown in full lines in Fig. 8, to an operative or extended position like the stoplscrews50 are'provided on an'angular,

frame member 5L connecting upright frame members 52;

dotted line position shown in Fig. 8. In the h [At one end, the shaft 49 projects and has rigidly secured thereto a pinion 53- This pll'llOllmeshes with agear segment 54: sup

ported on a pivot shaft55 which has'bear- 'ings in the frame members 52. An arm 56 is. integral with the segment 54 and carries an anti-friction roller 57 .for engagement iwithia cam'58 secured to a driven shaft 59. y

The shaft 59 has bearingsin the'frame mem bers- 52 and has fast on one end a worm 'Vwheel 60 arranged to be rotated by a worm 61 fixed onthe verticalshaft 35..

Slidable longitudinally in perforations in V the frame members'52 is a horizontal rod 62 for lockingithegear segment'54 in inoperavtive position. The rod 62 is normally urged toward'the segment 54!; by a spring 63 coiled on said rod and confined between oneof the frame members 52*and a cross pin on the rod. The gear segment 5lhasa perforation or recess 64 therein to receive anend of the rod 62' as best shown in Fig. (3, Electrically actuatedmeans are provided forr withdra'wingthe rod 62 from engagement with the gearsegmen't'al. This mechanism comprises a soleno d'65 having a plunger 66 and Y La lever 67-"connecting 'saidplunger to the Qrod 62, a pivotal support 68 for thelever 167 being mountedonone of the-frame membjers'52 and thesolenoid 65being supported Receiving stations Thelreceiving stations 38 arein all re I spects similar to the despatching stations,

except that the rails 70 for the former slope awayqfromthe main conveyor instead of toward lli illld there are no switches, corresp onding- .to theswitch as with its support, 7 the support is tilted by a box25 on-tlie stav tion- Sides 44L guidethe boxes in Q9 7 sage toward" the mainconve'yer.

' 38jis similar to the loading mechanism here inbefore described in all respects, except that the 71 are arranged, when excendedi'to slope away: from the main conveyer to "thereby deliverthe loads or boxes 25 to the associated receiving stations under the in-, v

1. controlled from floor Wire 131 connects With the supply Wire 114 and extends to one of the mercoid svvitches43 hich is in series rectangles 137 and 138; 'Currentfsupply Wires 139 and .140 have branches forming. parallel circuits each including 'thejsolenoids jects in the path of pins l tfifixed oaths; carr ers so that upon the approachof each, carrle to a despatching station the switch;

3. g 128. as'soeiated with that station is closed.

. despatching station "has previously been loaded. Movement of the arin 14C3jbya load In this manner the' presence or abs'ence lot ingstation is detected and the loading inec'l anism is rendered inoperativeitsuch cari r prefer to provide for the nnloadiiigiot With a closed switch 124; an open switch 128 and branch circuits including, as one branch, W1re 132, s0leno1d .65 and W1res183 and 119, andr as the other branch, Wires 113.45, switch 107, Wire 135, solenoid-97 and Wire In Fig. 10 the circuits particularly:associ-. ated With the delivery mechanisms for-floors Band C are indicatedrespectively in dotted 73 and each branch also inclndinga pair ofthebrushes' Oiie oi 'these branch CllCliltS is completed through the solenoid Tat floor-L Bi ui'ider control of the switch pins 011;

Wheel 88 and the other branch includesthe solenoid 73 at floor Cfundercontrol of the pins 90 on Wheel 89; 1

:Asshown inlligs' Tand 8, a'pair ofthe switches 12$.and 124 are located near-each; loading station. -The switch 123 has a mo'v able arm 14:1 and is fastened to the conveyer frame in such position thatthe arm ltl pro Each of the normally closed switches 24 has an arm; 1&3 pro ecting'in such position as to beactuated by a loaded box 'on a oarrier in the event that the carrier approaching the,

on the carrier'causcs the switch 1245 50 be opened during the period when the associated switch 128 is closedhy thejsame carrier.

load .on a 'carrier a p'proachingithe 'despatc.

any carrier, Which; hasfnot previouslyiheeu uuloadeth at a terminalstationsuch as that j at floor A. To this endno electr c control is provided for the unloading (F 1) and said arms are the in. their extended or operative positionandjnoyelec trio switches, timer gwheel and "circuits shown' for controlling the sending er, loads 7 from any despatching station; to the receiving station atfiooivA'. {I have also-assnmech in the illustrated system, that there is (no. needlfor means tor despatching loadsifrom any floor to the receiving station on the same I 5- The timer Wheel-88am associatedwith.

delivery mechanism for-floor B soas racemtrolflsaid mechanism through the solenoid 73 at that floor and theftimer WheelIj-SQis similarly associated with the delivery mech-f anismg for floor '05 Where the unloading,

cated there-is no timer control for delivery p mechanism atfthat floor. 1- l i r i Asindicated in the wiring diagram, there are manually operableswitches106, 107, 108 l and 109- each in ciiieuit vith one of the solenoids-SG, 9?, 98 or 99. and the number of such solenoids provided ,i or each timer wheel'is' equal to thenu'mber of despatching stations from Whichloadsare to be sent to the receiving station associated JVlth the same timer wheel, ,Theseveral solenoids arev spaced around thenperiphery of a timer wheel from the brushes93 associated with eel the 'san'ie' whoel distances )ro )ortional to the distance along; the, main conveyer bee tween the-"corres )ondin desbatchiuo and receiving stations. yFo'r example, the sole noid 96 is spaced from the brushes 93 associated gwith thewheel 88 .an angular distance. which is directly proportional to the d1s-' taucehetween the loading mechanism '(specifically switchlzi'il tor floor A andrthe unloading mechanism for floor B the latter distance being measured along the conveyer;

chain 11in the direction of the movement oi thelcham from the despatchrng station to the delivery mechanism. Similarly the solenoid 97 is-spaced from the'brushes 93 foi' 'the wheel 88 a distance proportional to the distance} along the chain loetween the loadingmechanism for floor G and the delivery-mechanism for floor 13 with which the Wheel88is associated. r '7 Operation 1 111 the operationof the system, assuming" that a load or box*25 is to be sent from isclosedjaiid said-box is placedpn the antifrlction wheels 410] so as to actuate the switch east- 1001 13 to closed position.)

When this is done ithefarms 15 at floor I B i 1 are normally elevated as indicated inFig. a

8, being held'in that inoperative position by the locking rod 62; ,The switchJQi being normally closed, upon the, approach of an emptylcarrier 14. to 'the' des'patching station at floor '13, 13116 arm 1 11 otthe switch 123 is actuateiilto close said switch' and thereby coiiipll etelythe circuit through the solenoid GSat tl'iat des'pat'ching statioi'i' and also to complete the "circuit through'the; SOlGDOlCl 99 associated Wltlt the timer "wheel 8%) so thatbothjofisai'd solenoids are energized. The

"solenoid '65 actuates the 'rod62 to permit. movement of the arms 4;?) to the operative.

position showiihi dotted lines in Fig. 8;

passes ri en the renames tab the. path of the carrier *which thereupon picks, up the box and conveys it upwardfIWhiIe op eration v takes place at: the despatching fstation for floor B, theenergized s6lenoid99 causes the finge1'sY1O5fon ithe =.1ever 101 to v ,actuate one of the pins Ofcloivnwarldi ilt will :beunderstoodthat the timer-wheels 88 and 89 are continuouslyrotatefd and that the wheel 89,- rotating in'Tthe direction indicated b'ythe arrows '-in Figs. 3 and 4,

presents a pin 9O beneaththeQfingers' 105 at the moment solenoid 99- is energized. Thereafter; upon arrival of; the pin; 90 (which has been moved' downward to oper- .ative position) between the, brushes-H93-the conveyer chain will' hav'e moved the loaded "car-trier from the despatchin'g station fat floor. B2: tothe top ofthe elevator shaft and then down along the descending reach to I a position ashort distance abovethe delivery mechanism j 38' on floor, C; At "this moment the disk 92 carried by pin 90 Yeloses the circuit throughthe solenoid 73 controlling the delivery mechanism 'atjlfloor C so that the lockingrod62is actuated to releaseth'e arms 71.. These arinsfall ilnmediately" to the operative-position shown in Fig;- 6 under control of the cam 74 *for' the delivery mechanism at iloor CI This eration takes place justbeforethe carrier 14 with its loadoryb0x;25vreaches the" arms 71 so that continued mov'ement of the 1 conveyer carries the :boX to be deposited upon the arms 71. Finally the box'passes -by gravity away from the; main conveyer.

,upon the anti frietion wheelsfcarried by arms'71 and rails 70.

v,In a manner which will be evident from the v foregoing description,;-loads "may be sentfrom the despatchingistation ,at floor A to the receiving stations at floorsB and C under control lof thefswitches 106 and 108, one of said switches being'"opened switches-#107 ,or 109, as' i'the case may be,

:open the ,neXt'yempty carrier: picksiluppthe' -box and'transports it to thefiz zedflunload- It is to beounderstoodthat:' lieiforegoing is merely descriptive of one rem-arm in= claims.

vention and that many Inodificationsinithe construction and arrangement of the coni veyer. ,and number and, arrangement of ;'d.e

spatching and receiving, stations may; be made within Q described claim as new anddesire tofprotectf by Letters Patent is:

the scope; of appended -1'.i The combination with a co11veyerhav-' "ing carriers, of a despatching vstation, a

plurality of receiving stations,- power-actuated loadin mecl'i'anism at said despatclbingf station Ior floading saidfcarriers, iani' QlQl-QCtI'lOCODtiOl vmagnet for each-"of said 7' I ji'eceiving'Y'stationsV and for. said loa ding fmechanism,:"manually operable switches at despatching station for selecting the pla'ceiof del1very,fa' carrier switch operable "upon the approach of a carrier to said despatching:station, a loading switchjoperable I I :bya load on said loading mechanism, an 1 1 electric circuit including [said control mag f net, for said loading mechanism and said carrier andfloading switches, and a timer un- -der control :of' said i manually operable nets for the receiving stations comprising a relation to: the conveyer and circuits sevl-o erally including sa d control' magnets and each under control ofoneof said movable switch element's? i 1 2. The'combination with a conveyer hay ing carriers, of a despatching station, aplurahty of receiving stations, -vpoweractuated loading mechanism at said despatching s ta series of switch elementsinovable in timed" switches forfactuating saidgcontrol magf tio rfor loading said carriers,anelectriccon trol magnet for each of said receiving stauallyoperable switches at said despatching .95 tions, and for said loading mechanism, man- 'station'f 01: selecting the place of delivery, a

-a' carrier switclioperable upon the approach 1 'ofafcarr1er"to vsa d despatcjhmg station, a

loadingswitch operable'by'a loadonfsaid -loading mechanism, "anelectric circuit inw eluding said control-magnet for saidlloading ine ch'anisin andqsaid carrier and lo adi'ng swltches, and a timer under "control of'sal it manuallyoperable switches for actuating j said control magnets for thereceiving; stationsc'omprisinga series of switch supports movable in timed relation to the'conveyer, movableswitch elementsmounted on eachof said supports, electromagneticdevices for. r

rendering said elements operative, branches of i said j first-mentioned: circuits 1 including said manually operable switches and electromagnetic devices and circuits severally includingflsaidcontrol magnets and each un-. der control 'ofsaid movable switch elements carried by'one of said "supports.

The combination with a conveyer having' a series of carriers, of a despatching sta- 5 tion, a. plurality. of receiving stations, pow- V fer aetuated loading mechanism at s'ald despatching station for load ng, said carriers,

an elcctriccontrol inagnet for each of-said receiving stations and for said loading mechani'simmanually operable switches at said *desp'atching*station for selectingfthe place j of deliveryfa 'carrierswitch operable upon the approach of a carrie'r to said despatch;

5mg station, a loading switch operable by] i load on said loading mechanism, an electriccircuit including said control magnet for sa d loading, 1nechan1sm and sald carrier and loading switches, and atimer under control ofsaid manually operable-switches }-i:'-or actuating said control magnets for the vreceiving stations comprising a plurality of Wheels revoluble in timed relation to the convcyer, a number of switch elements equal of the carriers on the conveyer, and circuits severally including sai d control. magnets and switch eles in unison ith said conveyer, one. ofsaid supports being provided for each of said receiving stations, a switch contact mounted adjacent tothe path of each of said movable v supports, a number of movable switch elements equal to the number of carriers onsaid conveyer' mounted on each of said sup,- ports and spaced apart thereon according to the spacing of the carriers, said elements being adapted When in operative position, toactua-te said switch contacts, an-electro inagneticdevice associated, with each of said movable supports for actuating said "elenients to operative position and" each of said devices being spaced from one of said switch contacts along the path of the"a-ssociated support'a distance proportional to-the distance along'the conveyor fromsaid' despatching station to a receiving station, an electric actuating magnet for each of said receiving stations, a manually operable switch at said despatching station 'for each of said electric actuating magnets, electric circuits severally undercontrol of said switches and severallyincludingsaid elec tro-magnetic devices andeelectric circuits severally under control of said contactsrand elements and including said electric actuating magnets. l

5. The combinationlwith a conveyer having a series of spaced carriers,of a plurality ofdespatching stations, a plurality of receiving stations spaced along said ,conveyer' at various distances from said despatching stations, and means forselectingthe receiving station to which aload is to be delivered comprising, a series of movable supports for switch elements, means for actuating. said supports 1n unison Wlljh sald conveyer, one "of sald supports bemg provided for each to the number of carriers spaced on, each of 'said Wheels 111 accordance wlth the spac ng the receiving station to ofsaid receiving stations, a'switch contact mounted ad-jacent ito thepath of eachuof said-movable supports, a Illlll'lbfil' of mov ,qable :SYVliZCll elements equal tow the number of carr ers on the conveyer mounted on each of said supports and spaced apart according to thespacmg of said carriers, said elements being adapted,when in operative p0 sijtion-to actuate said switch contacts, electromagnetic devices;for-actuating saidele" ments to operative position, a number or said last mentioneddevices equal to the mun ber of despatchmg stations less one being provided for each ofsald movable supports and each of said devicesbeing spaced from onecfsaid switch contacts along the path of the associated support a distance proportional to the distance along the conveyor [from a despatching station to a receiving station, an electric actuating ma net for each OfSitl-(l recelv ngstatlons, a manually operable switch at each of said .despatching stations for each of said electric actuating magnets, electric circuits severally under control of saidswitches and severally includrug said electromagnetic devices for actuatlng said dcvleesand electrlccircuits severally wider control of said contacts and elements and inclu dingnets.

said electric, actuating mag- '6.-T he combination with an endless conveyer having a series of carriers secured;

thereto, 'otdespatching and receiving stations. spaced along said; conveyer, delivery lIlBCllilHlS Ill' associated W th said receiving stat1on,'a travellng support for switch elements operatively connected to said conveyer, switch elements movably mounted on said support, one of sald elements being provided on saidvsupport for each of said carriers and said elements being spaced on said 'support according 'to the spacing of the, carriers on said conveyer, means for actuating said elements to inope 'ative position, control means arranged to be actuated by said elements when the latter are in operative position, means operable by said \QO ntrol means for rendering said delivery mechanism operative, manually operable meansat said ,despatching station and means under control of said manually operable means for actuatingfsaid elements to operative position. j V v 7. "The combination with a conveyer having a series of carriers-secured thereto, of despatching and receiving stations disposed along said conveyer, delivery'mechanism as sociated with said, receiving stations,-travelconnected-to said conveye'r, one of said supports bemg provlded for each of said dehvery mechanisms, switch elements mov- 'ingsupports for switch elements operatively ably mounted on said supports,one of said elements being provided on each support for each of said carriers and said elements actuating said tion." r

9. The COIIlblHLiJlOIL with. an ei dless.con-* the spacing of the carriers onjsaidconveyer, means for actuatingsai'd elements to inoper ative position, control means arranged ad-. jacent to each of said supports to be actuated by said elen'ients when the latteiiare in operative position, means under control of said control means for respectively rendering said delivery mechanisms operative,

manually operable means; at said despatching stations and means under control of said manually operable means for actuating said elements to v operative position.

S. The combination with a conveyor having a series of carriers-secured thereto, of despatching. and; receiving stat-ions disposed alongsaid conveyer, delivery mechanisms associated with said" receiving stations, a

ments being spaced on said wheelsacco 'dingtothe spacing of the carriers on said conv'eyeiy neans for; actuating said elements to inoperative position, control 111GiLl1S, 2 11 ranged adjacent tofeach of said wheels vvo be actuated by said elements \vllli-tliela ter are in operative position, meansVii'nd'e .v control of said control {means tor respec tively rendering said delivery mechanisms operative, manually operable ii eansfiat said despatcliing stations andineansiinder contI'Ol'Of said manually operable means for veyer' having aseries of carrie rs'secur'ed thereto, of 'despatching and receiving sta-j' to said 'conveyer, wheelsffixed on said shaft,

one for each of said. delivery mechanisms,

switch elements movably mounted on said wheels, one of said elements being provided on each wheel for each of said carriers,

elements to operative posi-P -niagiieticdevices a distancaaround the pesaid elementsbeing spaced. on said jwheels according to thespacing of the carriers ;on said conveyer, means for actuating said ele; ments to inoperative position, electro mags. netic devices for actuating, said elements to operative position disposed adjacent to each; of saidwheels, control means arrangedad jacent to each of said 'vheels to be actuated by said elements when the latter are inv operative position, means 'iindercontrol of said control means for respectively-actuating said deliverymechanisnis, manually operableswitches at saiddespatching stations and electric circuits under control of said switch- 10."1The combinationzwith a conveyer iiav'-' ing a series of carriers, of despatching and J receiving stat ons disposed along said conveyer,=del verymechan sms at, said receiving to said 'conveyer,--wheels fixed on said shaft,

one for each-of said delivery mechanisms,

switch'pins inovably inounted on said wheels,- one of said pins being provided on each wheel for each of said carriers and said pins being spaced onf said wheelsaccording to the spacing of the carriers on saidconveyer, means foractuating said pins to'inoperative position, eleetro-inagnetic devices for actuating sa idfpins tooperative position, said devices being "mounted 1 adjacent tosaid. wheels, switch contacts arranged to be rendered operative by said pins when the latter are in operative positio1i,'each of said contacts being spaced-from one of said electroriph ei'y of one of Wheels, proportional"- to the distance along Sald; conveyer of a re ceiving station from a despatchingi station,

stations, a timer shaft operatively connected circuits, including said contacts respectively,

liter actuating saidyd'elivery mechanisms, manually operable sw tches at said despatchingf stations and electric circuits undercontrol .of said switchesandincluding said e1ecti 0-,

' magnetic, devices for actuating said pins.

WI LIAM j io iii inson.

\ ism 

